[R] ANCOVA in R, single CoVar, two Variables
tom.wardley at exosect.com
Tue May 11 15:55:49 CEST 2010
I am VERY new to R, just picking it up infact. I have got my head around the
basics of ANOVA with post hoc tests but I am struggling with regression,
especially with ANCOVAs.
I have two sets of data, one of type A, one of type B. Both have been placed
in a wind tunnel and sampled every week. The co variate is of course the
days since the start.
An example is
day A B
0 10.0 10.0
7 9.0 9.1
14 8.0 8.2
21 7.0 7.3
28 6.0 6.4
35 5.0 5.5
42 4.0 4.5
49 3.0 3.6
56 2.0 2.7
I have been able to do ANOVA on similar data without a co variate, everyone
else seems to use ANCOVAs very different to how I do, either that or I am
the only one doing something this simple.
Could anyone please explain how to perform the analysis, I currently have
the data in R in a data frame I have called anco.
Thanks for any help.
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